Leg-joint for calipers



(No Model.)

L. S. STARRETT.

LEG JOINT FOR GALIPERS, DIVIDERS, &c. No. 375,658.

Patented Dec. 27, 1887.

N PETERSuPholo-Limowphn Waovlnnon. lZhC- UNITED STATES PATENT OFFICE.

LAROY S. STARRETT, OF ATHOL, liIASSAGHUSETTS.

LEG-JOINT FOR CALIPERS, DIVIDERS, 86C.

SPECIFICATION forming part of Letters Patent No. 375,658, dated December 27, 1887.

Application filed October 1. 1887.

To all whom it may concern:

Be it known that *I, LAROY S. STARRETT, of Athol, in the county of Worcester and State of Massachusetts, have invented a new and useful Improvement in Leg-Joints for Calipers, Dividers, 850., of which the following, taken in connection with the accompanying drawings, is a specification.

This invention is an improvement in the class of instruments having two pivoted legs connected by a spring,and also by a threaded rod and nut, serving to adjust and hold the legs in the desired position.

My improvement relates to the devices by. which the legs are joined together pivotally, the peculiar feature being the pivot inserted through one of the legs and through pivotplates secured to and projecting from the other leg. By myinvention the joint is greatly simplified and cheapeued, as the connected ends of the legs are made exactly alike and plain or without the usual tongue and recess of a hingejoint, while the thin pivot-plates secured to the sides of one leg project to the same extent along the sides of the other to receive the connecting-pivot. The result is a novel joint of very symmetrical construction and finished appearance.

Figure l of the drawings is a side View of a pair of calipers, and Fig. 2 an edge view of a pair of dividers in which my invention is embodied.

A B are the two legs of the instrument, and (J the spring, in this case shown as pressing together the ends of the legs above the pivot, and thus tending to separate their lower ends.

D is the connecting-rod, pivoted at one end Serial No. 251,183. (No model.)

It is 010- 0 the lower ends of the legs together, instead of separating them, in which case the not would be difierently arranged.

F represents one of the pivot-plates, both of which are firmly secured to the legs A, preferably by two pins, G, passing through the three parts.

His the pivot, passing through the other leg and through the projecting portions of the plates F, between which the leg'B is received and fits snugly. With this construction the plates F, and the leg A, fixed thereto, have a slight swinging movement on the pivot H in opening or closing the legs of the instrument.

The ends of the spring 0 are fitted into notches in the legs A B, so as to retain their places by constriction. The upper ends of the legs are beveled in the usual manner.

I claim as my invention- The instrument described, consisting of the legs A B, the plates F, fixed to one leg, and the pivot H, through said plates and the other leg, in combination with spring 0, connectingrod D, and adjusting-nut E, substantially as set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 12th day of September, A. D. 1887.

LAROY S. STARRETT.

Witnesses:

EDGAR V. VVILsoN, CHARLES P. FAY. 

